The Gamma-Ray Energy Response Of The Oslo Scintillator Array Oscar

The new Oslo Scintillator Array (OSCAR) has been commissioned at the Oslo Cyclotron Laboratory (OCL). It consists of 30 large volume ((empty set) 3.5 x 8 inches) LaBr3(Ce) detectors that are used for gamma-ray spectroscopy. The response functions for incident gamma rays up to 20 MeV are simulated with Geant4. In addition, the resolution, and the total and full-energy peak efficiencies are extracted. The results are in very good agreement with measurements from calibration sources and experimentally obtained mono-energetic in-beam gamma-ray spectra.